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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd3dd5524810f8ded55d2b13dc19043b67565c687a0e87695c06da63a8a798126' 
  AND token = '2NxHvxSBzf8xfbZxxoCyvQIu81L0I5/X2h32/FKxbss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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