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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a0a5846ae847f051daaa702c51f1ab07613cf5ba2c4a8002e5abf366e45036d' 
  AND token = '39t9IWreo74JQfpOYE7PxayX6UnJfdOkfWfbp92fyWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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