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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8e1802dbb3e06e41cb379c8a99a1d72817946c66445d05250c4c72f12556edb' 
  AND token = 'w5QJUc4rIUPuV3twPf3Eh6NxPakzyqznVsbf5MObbmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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