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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11515e085c5ba2721f357edf940b599b25d58b24e57654be8a89dc80a60ccf08' 
  AND token = 'xn1IPYSJSWfBTviJnM1VcR1jzrKQL+41qklFAly2kEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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