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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '64aa600fbe180d98648d5363e52afe77ab5e6603b10ca5e4cf7acbe06d1b9e2a' 
  AND token = 'om/JlX/+IBQaR338FRRbRp0gDk5Lbex6xaokJgmBCys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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