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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '524fc06ebfba7a86c0eb4b3c997b8a824a9f3e4ad4ba64d1d21a8256c151b4e0' 
  AND token = 'VPhBF8pM8Bs/hfTqV9hByp480euqbjOR38/N9CSzfgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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