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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8cd0f886641f630bf39cdbc00f7a484056807c4a6c7ff23f623416354208049e' 
  AND token = 'kBcFBrc5O012LULfPt9liI5UL/RfXlY0UHACpJlMSHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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