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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8386c26f10eaf0724cad2a6aa2544a178dd788f630d3f0c648648a879f4da75e' 
  AND token = 'SeVX/liekQ51Et9PEQJ+YTL9PywT6R1CdSM0lSlYOBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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