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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0fad1ff1db2f3e91cebd537b8efa3f57c7bccac2d1507407eda84c07052f1942' 
  AND token = 'mBLBiP7Jc6jbGSlsvrzhNvZjUaQfn3dEUNf8uYcg91M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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