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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f4cfd783f85cee97616bdd1f4d6716e665f9c1a27ba02a5abbde51c84222284e' 
  AND token = '5EDZf0EZUOFhRcr6QNBOMKFsyHHneNnj0dvgeDRSYQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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