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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f2430e031db3aea83c0776245c0d353e37b054e74869a06a85c011ac083723e3' 
  AND token = '1ti27fWX0jvomqdtynvI1d5yCFcivYHDXvxQ0t9jDcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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