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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ee62c9325d695417cfbe453b0a1dbbe0c7f4e34fe5483ea0fc5bcf7e3a2188e1' 
  AND token = 'IJEAn4IM7Cd4c/1guTIxIN8RTCA0sMEGxASMgxl/YXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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