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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b5dc769aa6e43235699cc51b402f6d6249b3fb2c7e1ec78c66026834d24c59c2' 
  AND token = '59ty0+pJAxcAyEjG7iT5R+/obuGI5UAr9gUFQQc3+B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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