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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c17ca591ef7b18bda29ae94230fde32b6ce4b89b1a2320b8d96ceef5250b6439' 
  AND token = 'clgBUCdIm7HsMh06d2EBuGJ56XELiYpHYmHOfx1o9QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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