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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd41e664021ed00cd15af28afe0d66a71004c206cc66962c0c6e3bc4d1045d6b2' 
  AND token = 'HZ13UYr3ouc1wk+XsPALZsIOpVIf405iZ4VqotrvX8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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