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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a7bc7f165a08eac38df786efbdeada85965e1b398a5de7ffe5b42326f9cf321f' 
  AND token = 'D3x9T/YIV9U54rFrOOwV0+ZI0XPA1P4RybyQl6CmNZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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