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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '36bd585c7d136bf0b2acd8d464ac684de9b0887c3eda2f0eee9264b8f9347820' 
  AND token = 'sD/HCmK/N5DX61ovcs0od5pG6pc0tK/Q39NCJaJ7m6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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