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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26456450c187f918b1103108dbf3e3e037a30ada9d95b6ad7350d05b9036b18a' 
  AND token = 'GKeAlSfKcF6U+W2bId7oqiT2JZNuFpz2tEebCxthZCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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