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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ec712334130e1cf340c3e7be612d1fd1f498b8a36638115334c7cfebbf05da7' 
  AND token = '5C5wSS7jpPKW0IoabFjzjW4vqFDebXC8Y9vi/p5+up0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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