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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '74981b93d52e417e1ad76685058d43e46530a0ac1d80198b5f05c3bb0f2119a7' 
  AND token = 'iGK94MRClEAyjEBAFZn1b+r2PR0H4+j03su6+9CkrrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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