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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '14086e199628466b6d1385f2da24cb9aa06963a1b415daa1382e66c4d7abc078' 
  AND token = 'XUp/BDZyNXF5ydM2tTOKPobGay0FAK2QZ4wRlDoTTdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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