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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '017224716e2db29b3d0852b94177228817e8414baa2c9fe5946b29a23d01a49e' 
  AND token = 'tp8TXv9nGcz7F5CHz/4vpszkvG8wra8bEJmfqcHNGAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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