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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ff14c687e8f2169d5943536fa2370b96ed410376bfc5d4188e4a97b22829285' 
  AND token = 'ZEQE6uQq6LlIMeEBd2peqireudKDlT94Da6mN98mYXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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