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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '26bbb012b48b1e15e1be074b28a8fa4ccdfabd5259e428f3664e8778423ff7c3' 
  AND token = 'aPOoO+45ZYX62CDBdAYhCSGIvf/GeXyJbySkf9WNtj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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