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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dfbb8eb392052eaaca8a83d5a9b40917650e95d198fab0aac142877d34a81087' 
  AND token = 'PKIlxPXlyG1cYlNi2Li9mC4mHpy3AeT2Mub0UlR5toE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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