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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c07e28d8c2ea5b32238ef18d9a47a84d29181b832d1d97313c90118e2ea57797' 
  AND token = '9RB3XFsMipt5KFcGj/CsMzlMBWx8VcSl93kP9aFS1i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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