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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4cc57dea14573e5c5ae6f3771bad0aea37618caf6c6f724b85257f58b6487f37' 
  AND token = 'iSSuFm9/Uf2dR0DXbBFmX9nSQUynk0/LjQu/vAoa3zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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