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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '796c94e9e95e9102dc26be31a3af7f006006da4f04b67fa24bb6caedcebb9a54' 
  AND token = 'gUvCpbw/ty3fUzqOQ+8RbI1C3FehVwksNtMdAe5cRhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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