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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fa3c8ce0755d88e5b149388b64dadef6eecd3d9d81cba5ee575ab643c207d17c' 
  AND token = 'qO1dKCEKW7EeAddzG/a7dVnt2ZmT16z2rPxzQP6dODQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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