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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ed615f8c666c9edc54ac43da91eddd191f0116ca98d1eedb711ec63886dd642' 
  AND token = 'jbAnN0gVjFEUhUY22wwtNBXgz596sEtlAM3KSc5FuVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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