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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b073960ddee72e5b507157ebe844b90c5f94197da57f85a87f7d90550e5ef39' 
  AND token = 'PRE40WCvml25zViL54IRYvPDa/KTzNHdF63Gs7RKfgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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