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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1a11f5bf75fbc55b7984adf5e8ed6f42de978395e3adb3377d1854396f150da0' 
  AND token = '43+lxvM4z+gRkjPSD+3TLRBNKYbTQ1Z5ETQC530S6Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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