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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b6646da8a2c7c30505b85f9db43649849a896326f4a1b67c089dc813403810bf' 
  AND token = 'wyKdVWSCTdrEqa9SAOgXpk7ZZZSTI13HYytPnLGxEXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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