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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7de233529831f5e8c1fe3722cac9c727e8bc07afc299182f09716f8fb34b3fb3' 
  AND token = 'zabYh1p5mLCvwuo6W8dSqk9b+2BFdBzMV9Bcypmev6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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