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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c740b3abdc8365d9ce3ace5a7ab2a16ac1caf70d796134a47c0546eaff10b55c' 
  AND token = 'Ge/PLl++WCvzE4Lidt9Cyw466MEhi4JWapVBaq8ssi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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