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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'db25c9103a95d5d7eaec42c67076d055972afaeadd942548276850e246cc3316' 
  AND token = 'fwAnoDBE1VrAHAolf5cxl5AF3fg1uByNIq78IVveFOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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