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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '79476b222843103f2869d17546c5d0d62246ac071a1c25bd72ec14ab448b3686' 
  AND token = 'nR5SbewrQjVk4QNxx0kpD8mGFBgXW2M5oshzrRJCSQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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