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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0ca7fa32c12ccaf78fdd7db697cf776279d5ec774bed49896a56457e396b42f1' 
  AND token = '3Qsob0ofGUcy9TR3xJb5qHWVszHznwCo/4T+aAtSWag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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