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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76bff41927e65019d9ac95cad94f59ed89b49e948c6703c6ddf95f7985db761e' 
  AND token = 'h4cxQeFCu789faS5hSg384Vwr4t2jvrHCrQ7pdgWSp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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