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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '770f13a10c6d45b9477b4a1b43d57b43ac45c1314d2edbb1ad0613929ddae5ae' 
  AND token = 'xRykBHS4T98fCuIOko6afzWYNH4OQkca5RJwLgJP+TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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