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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0442e7dd9288569073acaeba52ff3d17db34e62bcb96966a68f8c1372ad1b303' 
  AND token = '53P5OKX089NxmPISgvyxaQjC89atRVt929K2YpwVNxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}