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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '362155e5ee53094af710a778b3f6d6f24389fb59235ab7d10e71b12ba993abfd' 
  AND token = '2TZFQgeRkk5mB+CYV950LayfEL0xD1IUl1qDlObZkgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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