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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a5a65a3eb4fce6df06799210d03a345026a0a80d0a522c47b838e298967fc3d8' 
  AND token = '9ufPbXgOhKaKh6G7k1VnVWBQjhK19EeFDOQabFfISuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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