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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ecd6e811327c5fe3b2a7a60dfe37eaed936bbcd8f57875b1e3c095942b74d37c' 
  AND token = 'ArkTuPPP/b1msxiljF1ofPHFdBi+ed+bMtd//sbf1jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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