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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5b75f6b6c7effbcc722483985c8c7858fc0239c48f9cc8fa4412a32f207482a' 
  AND token = '5E8sBVi7X0Hwk9XkFVqU5F+tF3VTvwG1bwIXPVT0VHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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