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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f628694c5542b761315b054073816808679b5baa93487ad7787a4c781fa5b5e7' 
  AND token = 'G9+qCFEJU0GM87lt6hJARQajq+uAyHTU7T5q6mqnJwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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