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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '95d898214001ffec6254e4bf7a59e15387005abc53936526faef42fc463e63b3' 
  AND token = 'b0cRAUbINYuWnf8snfKPpjZH0y8/530HYPJwFE33lh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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