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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'af7d38087922aaf984f7d75911ae7ff01762209ca3bacb0cc43d106b4d7a2911' 
  AND token = 'SfVZsYJdfU77sOOb0yb/o4wk0LBos/3Ye5ezQ0gncBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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