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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd10406868bd5cad8e022ec72bd9b2b876dbbc95b25b2154c1141edfebd088b74' 
  AND token = '7GCn43HQegyfpwHkzsifwuH5vlWYtBOJ8G2erlbY0HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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