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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f635e2d3cf4c75689e750b462535b526ef0435d29e41ff1d007c82b72b28155b' 
  AND token = 'd7H1TZTsIX0tU+XcWjpAbBJ4+A0ozVTEURqbU7XpU7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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