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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5393c3ae422d0a15c8ca8a2cb66e74691b846a398df5aacbb29963afa3113886' 
  AND token = '/eaYQrPRPCl5ULGZRCSldResvBlZWZHaMputalLsQoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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