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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13e6fbd62a64fda8a08fa295c736ba0d8d44cdb765b56c4c6cacf772174ae01a' 
  AND token = 'qow2jZMQnntaj26wx+4EhIDS+Lw6Tmg4R0bD6Jlb3kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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