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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '306531647238c53a9b432ee93cb2282d3d282dbbdd64f451499d218bbfdb2e32' 
  AND token = 'qbUSCOSAcHftp0K+K6lQkAe75I0+tpc8V/HzwPM4MD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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