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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1d0396fc7cbfb1a93c620bfd3289199a807bb5530a6128f724b9a2df2e61b0b' 
  AND token = 'HXmCGVufk1lVfQ56t6fwelmRtJTrKPo4FoI9hbaUmHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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