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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7c694f2490054092746865573920e06831561a537d892679b2aa5cb9be44b18' 
  AND token = 'uSFC19a9RNdbEltFJuO5igtErcfb7zCZ75rXMCMzVtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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