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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '259eb756c8eac8d1112702d5efb2e71b9e51c5609d6a4eb924870d98e0633555' 
  AND token = 'NvDnxEtD2sQ6xDq31T+8Cj3VvmW0blkQX0kVH+kR3j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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