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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d06b8f31d5ebbdf960a9c6ffe5008bcf2864341cd1b1f4dff9eb1ec4a18e7e1' 
  AND token = 'WvvnoQnCYu6XsAisZv9wmGRF8Yp8zuHeGA9MIkM4/NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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