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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '09cf02e77f8867f229f02745936bb5c1e1cce46eb18a189dcff2650e478ae604' 
  AND token = 'eFWaUkfZFzmdIZgeW5yQ1f5Y5os9NJFYHo6/EbNavKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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