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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4711d5324ef6dda8f2ee21845b423855ca14666fec39672d208d34fd007fd4a1' 
  AND token = 'ZOyYJ+ikp3OSIR3n4TdVLM193R0cY7/7e2SImnYe+sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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