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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0cc1c26ea2419618b0c15c7e343a580d3efd5e3350019ca24f3ca1e662ce06f8' 
  AND token = 'rg5HU3ajzbPd7oTrbgheSW/Gp02W1O3c5XlKPthAEMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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