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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '552453858c4a09823f72b1a0935bb9bfdc3311e7aec7e2def716e91c4e50b0f9' 
  AND token = 'rJZHQTEiz3K2w851D4y4d1Yfrf88D9Gu5RJYKMh6nbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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