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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f693630e0babbf111eb477f9f792082a492b7f576cebdbd93c53d4bb5948167c' 
  AND token = 'm+aejuN1lfghgEYhDBmwDcYaa9mFEWCTDbtZeb2NPUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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