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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea8b6d279df0d50e9b92d4b28543e8cacba2d4334b9eefc9297f136e9998cc97' 
  AND token = 'HW+xybACh2YvhXoV4hrjbC6IwsxtCXEbCZ7cwINDdiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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