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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '28ee2e93f402ab4e33bfdd47b51a609be6b4dca3fc6b3fb40747d72f3a01167f' 
  AND token = 'bNMrV+Tbk64rT+C+9jzRGtO9tIcNtJwYdBCuopTJQag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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