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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6e12bf27984c9abe0654c6915761fb681c3af5432b6043e5ae5aca2607e501e0' 
  AND token = '+pbW+sLnMDohtf5QqPv0kCUq8go5Gp/PCYi2E5HL9ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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